<template>
  <header class="header">
    <h1>todos</h1>
    <input id="toggle-all" class="toggle-all" type="checkbox" v-model="isAll">
    <label for="toggle-all"></label>
    <input
      class="new-todo"
      placeholder="输入任务名称-回车确认"
      autofocus
      @keydown.enter="enterFn"
      v-model='task'
    />
  </header>
</template>

<script>
export default {
  props:['list'],
  data () {
    return {
      task:''
    }
  },
 methods: {
  enterFn(){
    if(this.task.trim()===0){
      alert('内容不能为空')
      return
    }
    this.$emit('addTask',this.task)
    this.task=''
  }
 },
 computed: {
  isAll:{
    set(val){
      this.list.forEach((obj)=>(obj.isDone=val))
    },
    get(){
      return this.list.every((item)=>item.isDone)
    }
  }
 }
}
</script>